¡Larguémonos (de aquí)! means "let's get out of here!", clear enough. It looks like larguemos + nos to me (Present Subjunctive of largar). Is there a rule about dropping s from emos in such a case? It looks quite natural, yet I can't find it.
Note, the question is about the removal of the S, which isn't the focus of the proposed duplicate.
When the nos reflexive pronoun is appended to a 1st-person plural imperative form (which would end in -s), that -s is dropped before adding the pronoun: dejémonos* de cuentos. Curiously, the -s is not dropped before other pronouns: abandonémosles*.
– fitojb Aug 02 '19 at 18:34ie: vamonos instead of vamosnos; alejemonos instead alejemosnos, anunciemonos instead of enunciemosnos , etc.
– Mike Aug 02 '19 at 21:35